There are different brands of auto paint meters on the market, but most auto paint meters are measured with Fe (with iron basis) and Fe (with non-ferrous basis). So far there is no auto paint meter whose substrate is plastic. Let's take the Linshang LS220 auto paint meter as an example to explain why the plastic bumper can't be tested with the auto paint meter. The main reasons are as follows:
1.General measurement principle of auto paint meter:
The general auto paint meter adopts the principle of Fe: Hall effect and NFe eddy current to measure the automotive surface paint thickness. Fe: Hall effect and NFe eddy current principles are based on electromagnetic effects and electromagnetic induction. We know that the power plant generates a magnetic field that in turn produces a power plant. But they are still based on metal substrate. Plastics, which are not electrically conductive in our lives, are insulators and do not generate magnetic fields. Therefore, this situation does not apply to the principle of Fe Hall effect and NFe eddy current. Therefore, plastic bumpers cannot be measured with the auto paint thickness.
2.LS220 auto paint meter is based on the Chinese national standard: "T 4956-2003" magnetic substrate on the non-magnetic cover layer thickness measurement - "GB / T 4957-2003" non-conductive coating thickness measurement on non-magnetic metal substrates- eddy current law. The above two Chinese national standards are based on "magnetic substrates" and "non-magnetic metal substrates". The plastic materials are not metal or magnetic. Therefore, plastic bumpers cannot be measured with the auto paint meter.